Magnification as a Probe of Dark Matter Halos at high redshift

We propose a new approach for measuring the mass profile and shape of groups and clusters of galaxies, which uses lensing magnification of distant background galaxies. The main advantage of lensing magnification is that, unlike lensing shear, it relies on accurate photometric redshifts only and not galaxy shapes, thus enabling the study of the dark matter distribution with unresolved source galaxies. We present a feasibility study, using a real population of z > 2.5 Lyman Break Galaxies as source galaxies, and where, similar to galaxy-galaxy lensing, foreground lenses are stacked in order to increase the signal-to-noise. We find that there is an interesting new observational window for gravitational lensing as a probe of dark matter halos at high redshift, which does not require measurement of galaxy shapes

Applications of Band Ratioing at Fort Irwin, California.

This dissertation describes the results of two projects that demonstrate the power of band ratioing of remote sensing data. The first method, Band Ratio Differencing (BRD), challenges the more traditional techniques for detecting environmental disturbance of the surface in and terrains. These traditional techniques are inadequate because they cannot identify the nature of the change (physical, chemical, biological) or the processes (natural, anthropogenic) involved in causing the change. In contrast, BRD of Landsat TM data has the advantage of providing information about changes in the composition of alluvial surfaces. These compositional changes, when combined with empirical field data provides insight into the specific causes and effects of environmental change. BRD was applied at Fort Irwin, California, the U.S. Army\u27s National Training Center (NTC) for desert warfare. Two dates of Landsat TM imagery (1985 and 1995) were acquired and BRD applied. A total of 514.5 square kilometers, or 42% of the alluvial surface at Fort Irwin has been affected by off road vehicular traffic. Two major types of change were identified: Disturbed Alluvial Surface and Continuous Dust Mantle, which can be further subdivided into six separate classes of change, related to either the cause or the effect of the disturbance. Hyperspectral Assisted Mapping (HAM) was developed as an alternative to Spectral Signature Mapping (SSM) techniques typically applied to AVIRIS hyperspectral data. Our analysis suggests that SSM-based techniques when applied to AVIRIS provide little to no additional information about sedimentary and igneous rocks. This is because many rock forming minerals of sedimentary and igneous rocks possess little to no diagnostic spectral absorption features in the range measured by the AVIRIS sensor. The HAM method integrates the geornorphic information provided by a Digital Elevation Model (DEM) and the lithologic discrimination, but not identification, provided by hyperspectral data to produce a surface materials map. HAM was successfully applied at the North Alvord Slope study area, on the southern margin of Fort Irwin, California. Nine distinct surface materials classes were identified by the technique. All nine classes were discriminated on the basis of minor mineral constituents in the materials, such as micas and clays

Effect of organic crop rotations on long-term development of the weed seedbank

Changes in the weed seedbank were monitored between 1991 and 1998 in two experiments that were established to compare organic crop rotations at two sites in NE Scotland. Two rotations, replicated twice at each site, were compared and all courses of both rotations were present every year. There were relatively minor changes in weed species diversity over time, but major changes in seedbank abundance. Weed seed numbers were relatively low in rotations with a high proportion of grass/clover ley. Differences in level of seedbank across the rotation were relatively predictable at Tulloch but much less so at Woodside where factors such as the effect of the grass/clover ley seemed to play a lesser role. Other factors, such as weather and its influence on the effectiveness of weed control operations, and higher populations of ground-living arthropods, may be affecting the Woodside seedbanks

Identification of the infrared non-thermal emission in Blazars

Blazars constitute the most interesting and enigmatic class of extragalactic gamma-ray sources dominated by non-thermal emission. In this Letter, we show how the WISE infrared data make possible to identify a distinct region of the [3.4]-[4.6]-[12] micron color-color diagram where the sources dominated by the the thermal radiation are separated from those dominated by non-thermal emission, in particular the blazar population. This infrared non-thermal region delineated as the WISE Blazar Strip (WBS), it is a powerful new diagnostic tool when the full WISE survey data is released. The WBS can be used to extract new blazar candidates, to identify those of uncertain type and also to search for the counterparts of unidentified gamma-ray sources. We show one example of the value of the use of the WBS identifying the TeV source VER J 0648+152, recently discovered by VERITAS.Comment: 5 pages, 4 figures, Astrophysical Journal publishe

Using intervention mapping to develop a culturally appropriate intervention to prevent childhood obesity: the HAPPY (Healthy and Active Parenting Programme for Early Years) study.

INTRODUCTION: Interventions that make extensive use of theory tend to have larger effects on behaviour. The Intervention Mapping (IM) framework incorporates theory into intervention design, implementation and evaluation, and was applied to the development of a community-based childhood obesity prevention intervention for a multi-ethnic population. METHODS: IM was applied as follows: 1) Needs assessment of the community and culture; consideration of evidence-base, policy and practice; 2) Identification of desired outcomes and change objectives following identification of barriers to behaviour change mapped alongside psychological determinants (e.g. knowledge, self-efficacy, intention); 3) Selection of theory-based methods and practical applications to address barriers to behaviour change (e.g., strategies for responsive feeding); 4) Design of the intervention by developing evidence-based interactive activities and resources (e.g., visual aids to show babies stomach size). The activities were integrated into an existing parenting programme; 5) Adoption and implementation: parenting practitioners were trained by healthcare professionals to deliver the programme within Children Centres. RESULTS: HAPPY (Healthy and Active Parenting Programme for Early Years) is aimed at overweight and obese pregnant women (BMI > 25); consists of 12 × 2.5 hr. sessions (6 ante-natal from 24 weeks; 6 postnatal up to 9 months); it addresses mother's diet and physical activity, breast or bottle feeding, infant diet and parental feeding practices, and infant physical activity. CONCLUSION: We have demonstrated that IM is a feasible and helpful method for providing an evidence based and theoretical structure to a complex health behaviour change intervention. The next stage will be to assess the impact of the intervention on behaviour change and clinical factors associated with childhood obesity. The HAPPY programme is currently being tested as part of a randomised controlled feasibility trial

COVID-19, Stay-at-Home Orders and Employment: Evidence from CPS Data

In this paper, we document the short-term impact of COVID-19 on labour market outcomes in Canada. Following a pre-analysis plan, we investigate the negative impact of the pandemic on unemployment, labour force participation, hours and wages in Canada. We find that COVID-19 had drastic negative effects on labour market outcomes, with the largest effects for younger, not married, and less educated workers. We investigate whether the economic consequences of this pandemic were larger for certain occupations. We then built indices for whether (1) workers are relatively more exposed to disease, (2) work with proximity to coworkers, (3) are essential workers, and (4) can easily work remotely. Our estimates suggest that the impact of the pandemic was significantly more severe for workers more exposed to disease and workers that work in proximity to coworkers, while the effects are significantly less severe for essential workers and workers that can work remotely.Last, we rely on a unique survey, the Canadian Perspective Survey, and show that reported mental health is significantly lower among the most affected workers during the pandemic. We also find that those who were absent form work because of COVID-19 are more concerned with meeting their financial obligations and with losing their job than those who remain working outside of home, while those who transition from working outside the home to from home are not as concerned with job loss

Oil of Chenopodium and Chenopodium Plants for the Eradication of Round Worms in Swine

1. The results of this series of tests indicate that if pigs are badly infested with worms, worming them once by an efficient method as soon as possible after weaning will reduce feed costs during the subsequent feeding period. 2. Worming the pigs a second time resulted in increased rather than decreased feed costs as compared with pigs wormed only once. 3. The results of two tests indicate that chenopodium plants may be used as a forage crop to eliminate worms and reduce grain and supplements required to produce 100 pounds of gain. 4. Cultural methods for development of chenopodium are now in progress, and as soon as completed specific recommendations as to its practical value as a forage crop for worming pigs will be made

HPV typing of vulvovaginal condylomata in children

No Abstract

Concept-centric Software Development

Developers have long recognized the importance of the concepts underlying the systems they build, and the primary role concepts play in shaping user experience. To date, however, concepts have tended to be only implicit in software design with development being organized instead around more concrete artifacts (such as wireframes and code modules). Palantir, a software company whose data analytics products are widely used by major corporations, recently reworked its internal representation of its software development process to bring concepts to the fore, making explicit the concepts underlying its products, how they are clustered, used within and across applications, and governed by teams. With a centralized repository of concepts, Palantir engineers are able to align products more closely based on shared concepts, evolve concepts in response to user needs, and communicate more effectively with non-engineering groups within the company. This paper reports on Palantir's experiences to date, analyzing both successes and challenges, and offers advice to other organizations considering adopting a concept-centric approach to software developmen